<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <meta http-equiv="X-UA-Compatible" content="IE=edge">

    <meta name="viewport" content="width=device-width, initial-scale=1.0">

    <title>Document</title>

    <style>

        input{

            border-style: none;



            border-bottom: solid 5px red;

        }
        
    </style>

</head>

<body>

    <form method="get"action="">

        <table>

            <tr>

                <td><label>用户名：</label></td>

                <td><input type="text"  /></td>

            </tr>

            <tr>

                <td><label>密码：</label></td>

                <td><input type="password"  /></td> 

            </tr>

            <tr>

                <td></td>

                <td><input type="submit" value="登录"/></td>

            </tr>

        </table>

    </form>

</body>

</html>